Check the registry. Back it up before making any changes
Find
HKEY_CLASSES_ROOT\.jpe
HKEY_CLASSES_ROOT\.jpeg
HKEY_CLASSES_ROOT\.jpg
The keys and values should be:
Name: (Default)
Type: REG_SZ
Data: jpegfile
Name: Content Type
Type: REG_SZ
Data: image/jpeg
Name: PerceivedType
Type: REG_SZ
Data: image
Click the + to expand each of the three keys, and you should find "OpenWithProgids" and "PersistentHandler"
Each PersistentHandler key will have a (Default) key wiht a value of something like "{098f2470-bae0-11cd-b579-08002b30bfeb}" Don't worry if it doesn't match mine
Each OpenWithProgids key will have two values: "(Defualt)", a "REG_SZ" type with data "(value not set)" and "jpegfile", type "REG_NONE" and data "(zero-length binary value)"
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